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My name is Mohamed Salim, a researcher in Meteorological Institute of Hamburg
University. I would like to consult you about one problem.

Currently, we are simulating the boundary layer of Hamburg city using CFD code
and I need to produce the required mesh. The problem is that I have the data 
of
the buildings in the form of STL (triangular surface with its 3D three points
and its unit vector). My question is: "Is there any program which can produce 
a
solid 3D shape from the triangular surfaces (tetrahedral, hexahedral, ..etc?"
Or is there a method that I can check if a point lies inside these surfaces
(i.e., inside the building)?